Raspberry Pi - Controlling DC Motor - Both Directions

I have a raspberry pi and I was wondering if there was a way to make the GPIO pins control a DC motor in both directions.

I came up with a little schematic but I'm sure I did it horribly wrong.

Any suggestions would be greatly appreciated!

Parents

will2055 over 8 years ago

I have a project that depended on changing from a Pololu qik 2s9v1 motor controller with a simple logic level motor driver (L293D). It works great and here is my code:

/*
 * L293D_rpi_motor test.cpp
 * 
 * Copyright 2017 Brandon Williams <brandon.w2055@gmail.com>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 * 
 * 
 */

/* Raspberry Pi Model B2 Pinmap
 +-----+-----+---------+------+---+-Model B2-+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 | ALT0 | 1 |  3 || 4  |   |      | 5V      |     |     |
 |   3 |   9 |   SCL.1 | ALT0 | 1 |  5 || 6  |   |      | 0v      |     |     |
 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 1 | ALT0 | TxD     | 15  | 14  |
 |     |     |      0v |      |   |  9 || 10 | 1 | ALT0 | RxD     | 16  | 15  |
 |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | IN   | GPIO. 1 | 1   | 18  |
 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
 |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     |
 |   9 |  13 |    MISO |   IN | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |
 |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |  28 |  17 | GPIO.17 |   IN | 0 | 51 || 52 | 0 | IN   | GPIO.18 | 18  | 29  |
 |  30 |  19 | GPIO.19 |   IN | 0 | 53 || 54 | 0 | IN   | GPIO.20 | 20  | 31  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+-Model B2-+---+------+---------+-----+-----+


 */

/*
    The following software is a test for the L293D motor driver
as a greater project objective to integrate this IC into a shield for
the raspberry pi.

Pinout Map [L293D pin# (Function) -- Rpi pin# (Name)]
*     
    1 (Enable 1)   --  11 (GPIO 2)
    2 (Input 1)    --  13 (GPIO 3)
    3 (Output 1)
    4 (GND)
    5 (GND)
    6 (Output 2)
    7 (Input 2)    --  15 (GPIO 4)
    8 (Control V)  --  1 (5V)
    9 (Enable 2)   --  /
    10 (Input 3)   --  /
    11 (Output 3)
    12 (GND)
    13 (GND)
    14 (Output 4)
    15 (Input 4)   --  /
    16 (Supply V)
*
Truth Table for a Single Motor (F=forward, R=reverse, S=stop)
* Enable | Input 1 | Input 2 | Output 1 | Output 2| Dir.
*    H   |    H    |    L    |     H    |     L   |  F  
*    H   |    L    |    H    |     H    |     L   |  R   
*    L   |    /    |    /    |     /    |     /   |  S   
*/
#include <stdio.h>
#inlcude <wiringPi.h>

#define ENABLEPIN 0
#define INPUT1 2
#define INPUT2 3

int main void{
    printf("Raspberry Pi - Motor Control L293D");
    
    wiringPiSetup();
    
    pinMode(ENABLEPIN, OUTPUT);
    pinMode(INPUT1, OUTPUT);
    pinMode(INPUT2, OUTPUT);
    
    digitalWrite(ENABLEPIN, 1); /*Enable Motor 1 channel active*/
    
    for(int i=0; i>=0; i++){
        delay(500);
        printf("Forward Motion");
        digitalWrite(INPUT1, 1); /*Begin Forward Motion*/
        digitalWrite(INPUT2, 0);
        delay(1500);
        printf("Reverse Motion");
        digitalWrite(INPUT1, 0); /*Begin Reverse Motion*/
        digitalWrite(INPUT2, 1);
    }
    /* Stop Motors and Disable Motor 1 */
    digitalWrite(INPUT1,0);
    digitalWrite(INPUT2,0);
    digitalWrite(ENABLEPIN,0);
    
    return 0;
}

Reply

will2055 over 8 years ago

I have a project that depended on changing from a Pololu qik 2s9v1 motor controller with a simple logic level motor driver (L293D). It works great and here is my code:

/*
 * L293D_rpi_motor test.cpp
 * 
 * Copyright 2017 Brandon Williams <brandon.w2055@gmail.com>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 * 
 * 
 */

/* Raspberry Pi Model B2 Pinmap
 +-----+-----+---------+------+---+-Model B2-+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 | ALT0 | 1 |  3 || 4  |   |      | 5V      |     |     |
 |   3 |   9 |   SCL.1 | ALT0 | 1 |  5 || 6  |   |      | 0v      |     |     |
 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 1 | ALT0 | TxD     | 15  | 14  |
 |     |     |      0v |      |   |  9 || 10 | 1 | ALT0 | RxD     | 16  | 15  |
 |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | IN   | GPIO. 1 | 1   | 18  |
 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
 |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     |
 |   9 |  13 |    MISO |   IN | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |
 |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |  28 |  17 | GPIO.17 |   IN | 0 | 51 || 52 | 0 | IN   | GPIO.18 | 18  | 29  |
 |  30 |  19 | GPIO.19 |   IN | 0 | 53 || 54 | 0 | IN   | GPIO.20 | 20  | 31  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+-Model B2-+---+------+---------+-----+-----+


 */

/*
    The following software is a test for the L293D motor driver
as a greater project objective to integrate this IC into a shield for
the raspberry pi.

Pinout Map [L293D pin# (Function) -- Rpi pin# (Name)]
*     
    1 (Enable 1)   --  11 (GPIO 2)
    2 (Input 1)    --  13 (GPIO 3)
    3 (Output 1)
    4 (GND)
    5 (GND)
    6 (Output 2)
    7 (Input 2)    --  15 (GPIO 4)
    8 (Control V)  --  1 (5V)
    9 (Enable 2)   --  /
    10 (Input 3)   --  /
    11 (Output 3)
    12 (GND)
    13 (GND)
    14 (Output 4)
    15 (Input 4)   --  /
    16 (Supply V)
*
Truth Table for a Single Motor (F=forward, R=reverse, S=stop)
* Enable | Input 1 | Input 2 | Output 1 | Output 2| Dir.
*    H   |    H    |    L    |     H    |     L   |  F  
*    H   |    L    |    H    |     H    |     L   |  R   
*    L   |    /    |    /    |     /    |     /   |  S   
*/
#include <stdio.h>
#inlcude <wiringPi.h>

#define ENABLEPIN 0
#define INPUT1 2
#define INPUT2 3

int main void{
    printf("Raspberry Pi - Motor Control L293D");
    
    wiringPiSetup();
    
    pinMode(ENABLEPIN, OUTPUT);
    pinMode(INPUT1, OUTPUT);
    pinMode(INPUT2, OUTPUT);
    
    digitalWrite(ENABLEPIN, 1); /*Enable Motor 1 channel active*/
    
    for(int i=0; i>=0; i++){
        delay(500);
        printf("Forward Motion");
        digitalWrite(INPUT1, 1); /*Begin Forward Motion*/
        digitalWrite(INPUT2, 0);
        delay(1500);
        printf("Reverse Motion");
        digitalWrite(INPUT1, 0); /*Begin Reverse Motion*/
        digitalWrite(INPUT2, 1);
    }
    /* Stop Motors and Disable Motor 1 */
    digitalWrite(INPUT1,0);
    digitalWrite(INPUT2,0);
    digitalWrite(ENABLEPIN,0);
    
    return 0;
}

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